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Steel truss arc shack used for tunnel portal with permafrost in high and cold area

A steel truss and steel pipe truss technology is applied in the structural field of steel truss arc shed, which can solve the problems of unrealistic and large slope top span, and achieve the effect of slowing down the melting speed and ensuring the overall construction period target.

Active Publication Date: 2013-05-22
CHINA RAILWAY NO 5 ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the excavation of the design opening of the highway tunnel, the span of the slope roof is large, and it is unrealistic to use a full-height bracket to erect a simple sunshade

Method used

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  • Steel truss arc shack used for tunnel portal with permafrost in high and cold area
  • Steel truss arc shack used for tunnel portal with permafrost in high and cold area
  • Steel truss arc shack used for tunnel portal with permafrost in high and cold area

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Embodiment Construction

[0038] A steel truss arc shed for tunnel openings in alpine permafrost, comprising a main truss structure 1, a supporting connection structure 2 and a roof structure 3. Both ends of the main truss structure 1 are supporting connection structures 2 , and the space between adjacent main truss structures 1 is a roof structure 3 .

[0039] like figure 1 There are roof purlins 1-3 and roof structure 3 between all steel pipe trusses 1-1. In order to make it easier to see the structure of the steel truss arc shed, some steel pipe trusses 1-1 do not draw roof purlins 1-3 and roof structure3. The main truss structure 1 is composed of seven inverted triangular steel pipe trusses 1-1, sixteen truss rods 1-2 and roof purlins 1-3. The upper part of the steel pipe truss 1-1 is composed of two φ76mm×2.5mm 1# steel pipes 1-1-1, and the lower part is arranged into an inverted structure with a top width of 600mm and a height of 800mm by a φ89mm×2.5mm 2# steel pipe 1-1-2. Isosceles triangle. ...

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Abstract

The invention discloses a steel truss arc shack used for a tunnel portal with permafrost in a high and cold area. The steel truss arc shack comprises a main truss structure (1), a supporting connection structure (2) and a roofing structure (3). A reversed isosceles triangle is formed by two first steel pipes (1-1-1) arranged on the upper portion of each steel pipe truss (1-1) and a second steel pipe (1-1-2) arranged on the lower portion of each steel pipe truss (1-1). The rise-span ratio of the steel pipe trusses (1-1) is 4 to 35. The supporting connection structure (2) is composed of fourteen steel pipe stand columns (2-1), eight stand column pulling rods (2-2), foundation (2-3) and eighty four steel wire ropes (2-4). The steel truss arc shack is installed in one step and has multiple functions. An air conditioning function is achieved, heat is insulated in summer and preserved in winter, and thus the steel truss arc shack has the advantages of being cold-proof in winter, wind-proof, rain-proof and snow-proof in a full year and capable of achieving construction of the tunnel portal with the permafrost in the high and cold area with elevation more than 4300m in the full year.

Description

technical field [0001] The technology of the invention relates to a steel truss arc shed used for heat insulation in the construction of a tunnel entrance in an alpine permafrost region, in particular to a structure of a steel truss arc shed. Background technique [0002] At present, it is the first time that my country has built a long-span two-lane highway tunnel of about 5 kilometers in the high-cold permafrost area above 4300 meters above sea level. There are many worldwide problems in permafrost construction that need to be solved urgently. According to the construction experience of the Qinghai-Tibet Railway tunnel entrance that has been completed and put into operation, a simple sunshade (steel tube support structure covered with military quilts, geotextiles, and colored strips) is mainly set up at the entrance of the tunnel to prevent the freezing of the soil in summer. The function of cold protection and heat preservation, in brief, is to take measures to "control t...

Claims

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Application Information

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IPC IPC(8): E04B7/14E04C3/40E21D9/00
Inventor 蔡明玖林治国彭红运白腾飞
Owner CHINA RAILWAY NO 5 ENG GRP
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